London: Singer Mick Jagger, actress Judi Dench and scientist Stephen Hawking have joined hands with 200 more British stars who have signed a letter urging Scotland to give up its bid to part ways from United Kingdom.

It is to be noted that a referendum on independence will be done in Scotland after six weeks.

The letter is seen as an attempt by these celebrities to convince the Scots not to vote for independence during the September 18 vote. The campaign has been organized by "Let's Stay Together", a group which wants to give a voice to the millions of Britons outside Scotland who are not authorized to vote.

Only Scots living in the country can participate in the referendum, which means that people who living in the three other constituent parts of the UK - England, Wales and Northern Ireland - will not be allowed to vote.

Opinion polls show most Scots are likely to vote against breaking the union with England. But many of them are yet to make up their mind.

The letter campaign was started by Dan Snow and Tom Holland, well-known TV historians in Britain.

The letter was released at an event on the banks of the River Thames in London close to Tower Bridge. The letter contains signature of several extraordinary famous Britons.

"The decision on whether to leave our shared country is, of course, absolutely yours alone," said the letter, which was addressed to "Dear Voters of Scotland".

"Nevertheless, that decision will have a huge effect on all of us in the rest of the United Kingdom. We want to let you know how very much we value our bonds of citizenship with you, and to express our hope that you will vote to renew them."

Other big names who signed the appeal included actresses Helena Bonham-Carter and composer Andrew Lloyd Webber, singer Cliff Richard, show business impresario Simon Cowell, and actor Dominic West, star of cult U.S. series The Wire.